Refactor ConfigureWifiSettings for better testing

Fix: 34205150
Test: make -j40 RunSettingsRoboTests
Change-Id: I7a8a0c89c087365fb50f3a9edd2cf64b2dda647c

src/com/android/settings/wifi/SavedNetworkPreferenceController.java

@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.wifi;
+
+import android.content.Context;
+import android.net.wifi.WifiConfiguration;
+import android.net.wifi.WifiManager;
+
+import com.android.settings.core.PreferenceController;
+
+import java.util.List;
+
+/**
+ * {@link PreferenceController} that opens saved network subsetting.
+ */
+public class SavedNetworkPreferenceController extends PreferenceController {
+
+    private static final String KEY_SAVED_NETWORKS = "saved_networks";
+
+    private final WifiManager mWifiManager;
+
+    public SavedNetworkPreferenceController(Context context, WifiManager wifiManager) {
+        super(context);
+        mWifiManager = wifiManager;
+    }
+
+    @Override
+    public boolean isAvailable() {
+        final List<WifiConfiguration> config = mWifiManager.getConfiguredNetworks();
+        return config != null && !config.isEmpty();
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return KEY_SAVED_NETWORKS;
+    }
+}